Pension And Postretirement Benefits (Schedule Of Pension Plan Assets By Category) (Details) - USD ($) $ in Millions	Jul. 31, 2022	Aug. 01, 2021
Defined Benefit Plan, Plan Assets, Amount	$ 1,763	$ 2,220
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Plan Assets, Amount	266	376
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Amount	982	1,143
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Plan Assets, Amount	13	33
Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan, Plan Assets, Amount	1,261	1,552
Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Amount	534	702
Short-term Investments [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Plan Assets, Amount	27	41
Short-term Investments [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Amount	6	2
Short-term Investments [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan, Plan Assets, Amount	33	43
Short-term Investments [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Amount	27	26
Equity Securities, US [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Plan Assets, Amount	75	100
Equity Securities, US [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Amount	3	6
Equity Securities, US [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan, Plan Assets, Amount	78	106
Equity Securities , Non-US [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Plan Assets, Amount	162	233
Equity Securities , Non-US [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Amount	0	1
Equity Securities , Non-US [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan, Plan Assets, Amount	162	234
Corporate Bonds, US [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Amount	571	723
Corporate Bonds, US [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan, Plan Assets, Amount	571	723
Corporate Bonds, Non-US [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Amount	119	138
Corporate Bonds, Non-US [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan, Plan Assets, Amount	119	138
US Treasury and Government [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Amount	224	198
US Treasury and Government [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan, Plan Assets, Amount	224	198
Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Amount	20	33
Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan, Plan Assets, Amount	20	33
Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Amount	19	29
Municipal Bonds [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan, Plan Assets, Amount	19	29
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Amount	15	10
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan, Plan Assets, Amount	15	10
Real Estate [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Plan Assets, Amount	2	2
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Plan Assets, Amount	2	3
Real Estate [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan, Plan Assets, Amount	4	5
Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Plan Assets, Amount	11	30
Hedge Funds [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan, Plan Assets, Amount	11	30
Hedge Funds [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Amount	14	34
Derivative Financial Instruments, Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Amount	10	6
Derivative Financial Instruments, Assets [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan, Plan Assets, Amount	10	6
Derivative Financial Instruments, Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Amount	(5)	(3)
Derivative Financial Instruments, Liabilities [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan, Plan Assets, Amount	(5)	(3)
Equity Funds [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Amount	307	438
Fixed Income Funds [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Amount	87	117
Real Estate Funds [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Amount	99	87
Other Items To Reconcile To Fair Value Of Plan Assets [Member]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	$ (32)	$ (34)